An Extra 21st Chromosome Causes ______, Which Results in Particular

question 20

Multiple Choice

An extra 21st chromosome causes ______, which results in particular facial features and a range of mental impairment.

• A) Klinefelter syndrome
• B) Turner syndrome
• C) Cri du chat syndrome
• D) Down syndrome

---

Definitions:

Mature Vessel Elements

Components of the xylem in plants that form part of a continuous tube through which water can move.

Sieve Tubes

Specialized structures in the phloem of vascular plants that facilitate the transport of sugars and other nutrients.

Companion Cells

Specialized cells in the phloem of plants that manage the functioning and maintenance of the nutrient-conducting sieve-tube elements.

Cognitive Development

The process through which individuals learn and develop their ability to think, understand, and interact with the world.